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Related Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
BKF Capital    
Due to Qualstar    
Revenue from related parties $ 2 $ 2
Receivable from related party 0 4
Qualstar    
Due from Qualstar    
Due from Qualstar, beginning balance 24 3
Billed to Qualstar by Interlink 645 269
Paid by Qualstar to Interlink (617) (248)
Due from Qualstar, end balance 52 24
Due to Qualstar    
Due to Qualstar, beginning balance 12 2
Billed to Interlink by Qualstar 123 52
Paid by Interlink to Qualstar (101) (42)
Due to Qualstar, end balance 34 12
Proceeds from Fees Received $ 617 $ 248